US4179598A - Electric resistance welding machine - Google Patents

Electric resistance welding machine Download PDF

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Publication number
US4179598A
US4179598A US05/863,576 US86357677A US4179598A US 4179598 A US4179598 A US 4179598A US 86357677 A US86357677 A US 86357677A US 4179598 A US4179598 A US 4179598A
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US
United States
Prior art keywords
welding
lower bracket
implement
movable
welding machine
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US05/863,576
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English (en)
Inventor
Attilio Alessio
Carlo Parpaiola
Pier Antonio
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Individual
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Individual
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Filing date
Publication date
Application filed by Individual filed Critical Individual
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Publication of US4179598A publication Critical patent/US4179598A/en
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K11/00—Resistance welding; Severing by resistance heating
    • B23K11/30—Features relating to electrodes
    • B23K11/31—Electrode holders and actuating devices therefor
    • B23K11/318—Supporting devices for electrode holders

Definitions

  • the present invention relates to an electric resistance welding machine characterized by features which ensure a considerable versatility thereof, in the sense of its adaptability to various types of work, and a high productivity under the best conditions of efficiency.
  • the free height between the brackets must be considerable so as to allow, when necessary, the use of welding implements of considerable height.
  • This has the disadvantage of rendering more extensive the welding circuit connected to the transformer mounted within the upper bracket or near it, and involving an unnecessary increase of the impedance and hence power losses in the secondary circuit which, when the implement is in the working position, could have much smaller dimensions.
  • This object is attained according to the present invention by the fact that the welding transformer is not installed in a fixed position on or near the upper bracket of the machine, as is usual, but is rigidly connected to the vertically movable implement holding head, so that as the welding operation is being carried out the transformer also approaches the workpiece to be welded, thus minimizing the extent of the secondary circuit and hence its inductance.
  • Another object of the present invention is to obtain an efficient electrical connection between the secondary circuit and the workpiece holding table, at the moment of carrying out a welding operation, in the cases in which the table is movable.
  • This object is attained according to the present invention by the fact that the movable table is provided on its lower side with a rib directed according to the path of movement of the table (which path is rectilinear when the table is movable translationally, and is circular when the table is movable rotatably), and that at said rib there is provided a clamping means arranged to tightly apply against said rib a conductive jaw connected to the secondary winding of the welding transformer, during the welding periods.
  • FIG. 1 is a partly sectional side elevational view, on a small scale, of the welding machine of the invention
  • FIG. 2 is an enlarged side elevational view of the means for the electric connection between the movable table and the welding circuit;
  • FIG. 3 is a partly sectional plan view, on a still larger scale, of the sliding connection device for the welding circuit.
  • the machine shown in FIG. 1 comprises a substantially C-shaped structure resulting from a lower bracket 1, a column 2 and an upper bracket 3, which may be formed integrally with each other.
  • Column 2 is extended rearwardly by a cubicle 4 containing the auxiliary apparatuses.
  • the lower bracket 1 supports, by means of a support 5, a rotatable table 6 which, as shown by full and dashed lines respectively, may have a larger or a smaller diameter depending on the working requirements involved.
  • the rotatable table allows carrying out, on sections of the table, workpiece assembly and disassembly operations, whilst on the section situated near the implements the welding operations are carried out.
  • the means for controlling the rotation of the table 6 and its stopping in the correct position are not shown because they do not concern the application of the present invention and may be of a type per se known.
  • the upper bracket 3 carries, in a vertically movable fashion, an implement holding head which comprises a portion 7 in the form of a guide and a portion 8 forming a support for the welding implements, one of which is shown at 9 with dashed lines.
  • the means for controlling the lifting and lowering of the head 7-8 and its stopping in the correct position are not shown because they do not concern the application of the invention and may be of a type known per se. Also, neither described nor shown are the programming means which control and coordinate the various functions of the machine.
  • the welding transformer 10 is not applied to any fixed support means, as usual, but is rigidly connected to the guide element 7 of the vertically movable head, thus following the displacements of the latter.
  • a first advantageous consequence of this arrangement is that the electric connection of the welding implement 9 to one or, if necessary, to both poles of the secondary winding of the welding transformer 10 may be effected by means of rigid conductors 11, without the interposition of flexible plaited conductors or movable connections.
  • the second pole of the secondary winding of the transformer 10 is connected to a vertical bar 12, which may be cooled by water pipes 13 (FIG. 3), which bar extends vertically for a length which is proportional to the freedom of vertical movement of the head 7-8.
  • Said vertical bar 12 passes into the body 14 of a sliding connection means, which body is fastened to a fixed portion of the structure 1-2 of the machine.
  • contact shoes 16 Supported within body 14 by means of pins 15 are contact shoes 16 disposed at the side of the bar 12 and pushed into electric contact against the latter by resilient means, which in the present case are constituted by stacks of belleville washers 17 inserted onto pins 18. Furthermore, the shoes 16 are resiliently pushed in electric contact against body 14 by resilient means which in the present case are constituted by stacks of belleville washers 19 inserted onto the pins 15.
  • the bar 12 may freely slide vertically together with the transformer 10 and the head 7-8 and remain in optimum electric contact with the body 14.
  • This latter is connected to the workpiece holding support by means of a suitable connection, for example a flexible strap 20 or a group of such straps.
  • the workpiece holding support has the character of a rotary table 6.
  • This table possesses on its lower side a rib 21 which could be circular and continuous but of which only those portions are necessary which correspond to working stations; thus, in the embodiment shown, the rib assumes the appearance of a plurality of separate plane plates 21.
  • the one which is situated at the welding station has, disposed at the side of it, a conductive jaw 22 which is connected to the welding circuit. In the present case, this conductive jaw is connected through the straps 20 to the body 14 described in the foregoing.
  • a clamping jaw 23 connected to a movable support 24 which carries a hydraulic or pneumatic cylinder (or another driving means) 25 whose piston rod 26 acts on the conductive jaw 22.
  • the movable support 24 is movably mounted, for the purpose of centering the jaws, on a stationary support 27 mounted on the lower bracket 1 of the machine.
  • the cylinder, or the like, 25 When a welding operation is about to be effected, the cylinder, or the like, 25, is activated and clamps the plate or rib 21 between clamping means comprising the jaws 22 and 23, thereby establishing an optimum electric contact between the movable table 6 and the welding circuit. Conversely, during the periods of displacement of the table 6 the cylinder is released so that the jaws 22 and 23 move away from the plate 21 and do not hinder in any way the movement of the table.
  • the rib 21 has a rectilinear shape extending along the direction of movement and may be formed by separate plates aligned and corresponding to the various working stations.
  • a shield 28 may protect the rib portion 21, or plates 21, which are not active, to avoid soilings which would successively hinder the conduction.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing Of Electrical Connectors (AREA)
  • Resistance Welding (AREA)
  • Butt Welding And Welding Of Specific Article (AREA)
US05/863,576 1977-01-28 1977-12-22 Electric resistance welding machine Expired - Lifetime US4179598A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT67174/77A IT1116710B (it) 1977-01-28 1977-01-28 Macchina per la saldatura elettrica a resistenza
IT67174A/77 1977-01-28

Publications (1)

Publication Number Publication Date
US4179598A true US4179598A (en) 1979-12-18

Family

ID=11300206

Family Applications (1)

Application Number Title Priority Date Filing Date
US05/863,576 Expired - Lifetime US4179598A (en) 1977-01-28 1977-12-22 Electric resistance welding machine

Country Status (4)

Country Link
US (1) US4179598A (fr)
DE (1) DE2753215A1 (fr)
FR (1) FR2378598A1 (fr)
IT (1) IT1116710B (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4496821A (en) * 1982-08-06 1985-01-29 Marelco Power Systems, Inc. Transformer for robot arms

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5420935A (en) * 1977-07-15 1979-02-16 Nippon Steel Corp Conductor connector for flash welder
IT1167223B (it) * 1983-09-29 1987-05-13 Rosa Gaetano Di Impianto automatico per assemblaggio e saldatura di scocche di automaticoli,adatto ad altissime produzioni
CN105945466A (zh) * 2016-07-19 2016-09-21 河北羿珩科技股份有限公司 太阳能组件汇流带焊接供料装置
CN109079398B (zh) * 2018-10-18 2020-09-08 东莞职业技术学院 一种机电自动化焊接工作台
CN117324767B (zh) * 2023-09-15 2024-04-30 重庆奥方汽车零部件有限公司 一种灯具灯珠点焊设备

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1041778A (en) * 1911-10-31 1912-10-22 Hale & Kilburn Co Welding apparatus.
US1351909A (en) * 1918-11-11 1920-09-07 Mattie S Johnson Method of and apparatus for heat-treating metals
US2232450A (en) * 1937-11-29 1941-02-18 Bernhard Berghaus Method and apparatus for resistance welding
US2556602A (en) * 1948-04-10 1951-06-12 Charles A Schwartz Electrical coil structure for transformers

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1041778A (en) * 1911-10-31 1912-10-22 Hale & Kilburn Co Welding apparatus.
US1351909A (en) * 1918-11-11 1920-09-07 Mattie S Johnson Method of and apparatus for heat-treating metals
US2232450A (en) * 1937-11-29 1941-02-18 Bernhard Berghaus Method and apparatus for resistance welding
US2556602A (en) * 1948-04-10 1951-06-12 Charles A Schwartz Electrical coil structure for transformers

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4496821A (en) * 1982-08-06 1985-01-29 Marelco Power Systems, Inc. Transformer for robot arms

Also Published As

Publication number Publication date
FR2378598A1 (fr) 1978-08-25
IT1116710B (it) 1986-02-10
DE2753215A1 (de) 1978-08-03

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